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    <h3>演示返回值问题</h3>
    <a href="/ret/foo1" target="_blank">返回modelAndview方式</a><br>
    <a href="/ret/foo2" target="_blank">返回字符串视图方式</a><br>
    <a href="/ret/foo3" target="_blank">返回字符串视图加上forward前缀方式</a><br>
    <a href="/ret/foo4" target="_blank">返回字符串视图加上redirect前缀方式</a><br>


    <a href="/ret/foo5" target="_blank">返回给浏览器字符串</a><br>
    <a href="/ret/foo6" target="_blank">返回给浏览器json格式字符串</a><br>

    <a href="/ret/foo51" target="_blank">返回给浏览器字符串</a><br>
    <a href="/ret/foo61" target="_blank">返回给浏览器json格式字符串</a><br>
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